Blog Home How To Choose The Right Size Pool Filter

How To Choose The Right Size Pool Filter

by
Categories: How To Guides, Filters, Energy Efficiency
 
Like shopping for most major pool equipment it can be hard to understand the correct way to determine what model, size, brand, etc. equipment is best for you and your pool. In this article we go over the three types of filters and how to determine what size filter your pool needs.
 
Before you can choose the correct size swimming pool filter, you first need to understand the types of filters that are offered. The residential swimming pool industry primarily has three types of pool filters from which to choose. 
There are pros and cons for each type as well as differences in how well they filter particles from the water (measured in microns - a human hair is about 60 microns). We will quickly discuss the differences, advantages and disadvantages of each and then we’ll go over the things to consider when choosing the right size filter for your swimming pool.
  • Cartridge Filters
    • Pros:
      • Popular with higher horse power pumps as they can handle the most water flow.
      • Easy to disassemble and reassemble.
      • No back-washing.
    • Cons:
      • Needs a solution to properly clean between pleats (acid not recommended).
      • Water clarity not as clear as D.E. filtered water – filters down to 10 microns.
      • Replacement cartridge cost can be high.
  • Sand Filters
    • Pros
      • Low maintenance – sand is only replaced every few years. 
    • Cons
      • Least effective filter type – only filters to 20 microns, at best.
      • Lower GPM rating compared to D.E. and especially cartridge.
      • Must back-wash filter.
  • D.E. Filters
    • Pros
      • Filters to the smallest micron of any filter type – less than 5 microns.
      • Low cost for replacement grids.
      • Back-washing optional.
      • Best filter for removing algae.
    • Cons
      • Can be difficult to take apart and reassemble (excluding Quad D.E.).
 
One of the best products to hit the industry in recent years is
 
the Quad D.E. filter by Pentair. This filter provides the clarity
 
and other benefits of a D.E. filter while being easy to break
 
down and reassemble. This new innovative design is making
 
this model one of the most popular in the industry.

 
Now that you are more familiar with the different types of filters and the pros and cons of each, we can discuss the best way to determine the correct size for your application.
 
I would like to start by saying that with pool filters, just as with salt chlorine systems, always go larger! You can’t go too big. From all the backyards I’ve visited while in this business, I can easily say that far more often than not, the pumps are too big and the filters are too small. This should be just the opposite. This combination provides poor circulation and inferior efficiency. Not to mention higher electric costs as well as increased maintenance expenses from deteriorating filter components due to excessive water flow that the filter can’t handle.
 
Positive aspects of sizing a filter properly:
  • Longer filter cycles (less work for you as you will need to clean the filter less often or less money spent if you pay for the service).
  • Increased flow as the pump is not met with as much resistance from a filter that is too small.
  • Increased cleaning time if/when you face issues with algae.
To make this decision an easy one, you'll need to:
  • Determine the flow rate of your system - This is your pump’s rated gallons per minute. (Or it can be calculated as GPM, less resistance).
You can also add a flow meter to know exactly what your flow rate (in GPM) is.
 
For our example, let’s assume 
  • Your pump produces 70 GPM, after resistance is accounted for.
  • You want a D.E. filter because it provides the clearest water.
Here are the recommended residential flow rates for D.E. filters:
 
24 Sq. Ft. 36 Sq. Ft. 48 Sq. Ft. 60 Sq. Ft. 72 Sq. Ft.
36 GPM 54 GPM 72  GPM 90  GPM 108  GPM
 
In this scenario, the 48 sq ft D.E. filter would suffice, but the better choice for would be the 60 sq ft. This will give you optimum circulation, longer cycles between filter cleanings and less maintenance overall. Every filter type and size you consider will have a GPM rating for you to easily see which one will be a good fit for your specific scenario.
 
Should you still have questions or are uncertain, please feel free to give us a call at 888-836-6025 and we’ll be more than happy to assist you.
comments powered by Disqus
ABOUT THE STORE
Pool Supply Unlimited is an e-commerce company that loves water. We love to pump it, filter it, heat it, chlorinate it, light it up and stare at it while we're barbequing a fat, juicy steak. There are real pool professionals working here. Our guys have seen thousands of pools in their careers, no exaggeration. We are based in Southern California and can land most products to your door (within the 48 contiguous states) in less than a week.
YouTube Facebook Twitter Google+ Pinterest
COMPANY
ABOUT US
BETTER BUSINESS BUREAU
CONTACT US
CONTACTO
CUSTOMER REVIEWS
FAQ
HOURS OF OPERATION
PRIVACY
SITE MAP
TESTIMONIALS
MY ACCOUNT
LOGIN
FORGOT PASSWORD
LOYALTY POINTS
RETURN MERCHANDISE
PROMOTIONS
COUPONS
REBATES
NEWSLETTER
FINANCING
TERMS
INTERNATIONAL ORDERS
LOYALTY POINTS TERMS
RETURNS POLICY
SHIPPING POLICY
RESOURCES
BLOG
PRODUCT MANUALS
Visa Mastercard Discover American Express PayPal
McAfee SECURE sites help keep you safe from identity theft, credit card fraud, spyware, spam, viruses and online scams